"Enter PIN for Authenticator" for command ssh-add -K

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I am running into an issue in adding my .pem key to my ssh-agent. I have set up my Linux Ubuntu 20.04 system with Yubikey and it has worked great. Have not had any problems using my Yubikeys. Love the added security; however, when I run this specific command ssh-add -K I get this message Enter PIN for authenticator:. I typed in my pin number from my authenticator for GitHub and even pressed on my YubiKey but nothing processed through. Can anyone help me on this? I would greatly appreciate it.

yubikey ssh authentication
1 Answers

In the Apple version -K stores the password in your keychain, so you don't have to type it every time. In the non-Apple version -K "Loads resident keys from a FIDO authenticator".

So, Instead of writing

$ ssh-add -K ~/.ssh/private_key

write this :

$ ssh-add ~/.ssh/private_key

Replace private_key as your key e.g. $ ssh-add ~/.ssh/id_rsa

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